| 摘要 |
INHERENTLY NONROTATING RECIPROCATING DENTAL TOOL In a dental device comprising a drive head, an internal channel defined by an internal surface within said drive head, reciprocating drive means having a driving end portion extending into said internal channel, and designed to provide reciprocating motion to a dental tool, and a dental tool having a shank and a blade portion, said shank portion being retained in said internal channel, the improvement comprising a locking protrusion extending from the internal surface radially inwardly into the internal channel, and wherein the shank portion is rigidly secured to the blade and comprises a shank drive portion in operable connection with the driving end portion of the reciprocating drive means, a flange portion on the shank having an enlarged diameter relative to the shank and designed to fit slidably but snugly within the internal channel, and a plurality of grooves along said flange portion extending substantially parallel to the axis of the shank and designed to snugly hold the locking protrusion, the dental tool being thus restrained from rotary motion. |
